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Behavioural Neurology
Volume 6, Issue 1, Pages 37-41

A selective Impairment in the Phonological Output Lexicon

T. Imamura,1,3 A. Yamadori,2 M. Aoki,1 R. Mochizuki,1 and K. Kogure1

1Department of Neurology, Institute of Brain Diseases, Tohoku University School of Medicine, Sendai, Japan
2Hyogo Institute for Aging Brain and Cognitive Disorders, Himeji, Japan
3Division of Behavioral Neurology, Department of Clinical Neurosciences, Hyogo Institute for Aging Brain and Cognitive Disorders, 520, Saisyo-Ko, Himeji, Hyogo 980, Japan

Copyright © 1993 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


It has been proposed that words are stored in a functional structure which consists of a semantic system and modality-specific input and output lexicons. We report a patient with disturbed word finding for given letters, but not for specific categories. The patient had difficulty in phonological similarity judgements of pictures, but performed normally on semantic similarity judgements. We conclude that this patient's impairments stemmed from a disturbance restricted to the subsystem for active judgement and selection of representations in the phonological output lexicon.